Use unix-socket as communication channel

Signed-off-by: Alexander Morozov <lk4d4@docker.com>
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

Conflicts:
	ctr/container.go

containerd/main.go

@@ -57,6 +57,11 @@ var daemonFlags = []cli.Flag{
 		Value: 60 * time.Second,
 		Usage: "interval for flushing metrics to the store",
 	},
+	cli.StringFlag{
+		Name:  "listen,l",
+		Value: "/run/containerd/containerd.sock",
+		Usage: "Address on which GRPC API will listen",
+	},
 }
 
 func main() {
@@ -81,6 +86,7 @@ func main() {
 	app.Action = func(context *cli.Context) {
 		if err := daemon(
 			context.String("id"),
+			context.String("listen"),
 			context.String("state-dir"),
 			context.Int("concurrency"),
 		); err != nil {
@@ -140,7 +146,7 @@ func processMetrics() {
 	}()
 }
 
-func daemon(id, stateDir string, concurrency int) error {
+func daemon(id, address, stateDir string, concurrency int) error {
 	tasks := make(chan *containerd.StartTask, concurrency*100)
 	supervisor, err := containerd.NewSupervisor(id, stateDir, tasks)
 	if err != nil {
@@ -166,12 +172,16 @@ func daemon(id, stateDir string, concurrency int) error {
 	if err := supervisor.Start(); err != nil {
 		return err
 	}
-	l, err := net.Listen("tcp", ":8888")
+	if err := os.RemoveAll(address); err != nil {
+		return err
+	}
+	l, err := net.Listen("unix", address)
 	if err != nil {
 		return err
 	}
 	s := grpc.NewServer()
 	types.RegisterAPIServer(s, server.NewServer(supervisor))
+	logrus.Debugf("GRPC API listen on %s", address)
 	return s.Serve(l)
 }
 

ctr/checkpoint.go

@@ -28,7 +28,7 @@ var ListCheckpointCommand = cli.Command{
 
 func listCheckpoints(context *cli.Context) {
 	var (
-		c  = getClient()
+		c  = getClient(context)
 		id = context.Args().First()
 	)
 	if id == "" {
@@ -82,7 +82,7 @@ var CreateCheckpointCommand = cli.Command{
 		if name == "" {
 			fatal("checkpoint name cannot be empty", 1)
 		}
-		c := getClient()
+		c := getClient(context)
 		if _, err := c.CreateCheckpoint(netcontext.Background(), &types.CreateCheckpointRequest{
 			Id: containerID,
 			Checkpoint: &types.Checkpoint{
@@ -108,7 +108,7 @@ var DeleteCheckpointCommand = cli.Command{
 		if name == "" {
 			fatal("checkpoint name cannot be empty", 1)
 		}
-		c := getClient()
+		c := getClient(context)
 		if _, err := c.DeleteCheckpoint(netcontext.Background(), &types.DeleteCheckpointRequest{
 			Id:   containerID,
 			Name: name,

ctr/container.go

@@ -4,10 +4,12 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
+	"net"
 	"os"
 	"path/filepath"
 	"syscall"
 	"text/tabwriter"
+	"time"
 
 	"github.com/codegangsta/cli"
 	"github.com/docker/containerd/api/grpc/types"
@@ -18,8 +20,14 @@ import (
 )
 
 // TODO: parse flags and pass opts
-func getClient() types.APIClient {
-	conn, err := grpc.Dial("localhost:8888", grpc.WithInsecure())
+func getClient(ctx *cli.Context) types.APIClient {
+	dialOpts := []grpc.DialOption{grpc.WithInsecure()}
+	dialOpts = append(dialOpts,
+		grpc.WithDialer(func(addr string, timeout time.Duration) (net.Conn, error) {
+			return net.DialTimeout("unix", addr, timeout)
+		},
+		))
+	conn, err := grpc.Dial(ctx.GlobalString("address"), dialOpts...)
 	if err != nil {
 		fatal(err.Error(), 1)
 	}
@@ -46,7 +54,7 @@ var ListCommand = cli.Command{
 }
 
 func listContainers(context *cli.Context) {
-	c := getClient()
+	c := getClient(context)
 	resp, err := c.State(netcontext.Background(), &types.StateRequest{})
 	if err != nil {
 		fatal(err.Error(), 1)
@@ -90,7 +98,7 @@ var StartCommand = cli.Command{
 		if id == "" {
 			fatal("container id cannot be empty", 1)
 		}
-		c := getClient()
+		c := getClient(context)
 		events, err := c.Events(netcontext.Background(), &types.EventsRequest{})
 		if err != nil {
 			fatal(err.Error(), 1)
@@ -223,7 +231,7 @@ var KillCommand = cli.Command{
 		if id == "" {
 			fatal("container id cannot be empty", 1)
 		}
-		c := getClient()
+		c := getClient(context)
 		if _, err := c.Signal(netcontext.Background(), &types.SignalRequest{
 			Id:     id,
 			Pid:    uint32(context.Int("pid")),
@@ -276,7 +284,7 @@ var ExecCommand = cli.Command{
 				Gid: uint32(context.Int("gid")),
 			},
 		}
-		c := getClient()
+		c := getClient(context)
 		if _, err := c.AddProcess(netcontext.Background(), p); err != nil {
 			fatal(err.Error(), 1)
 		}
@@ -290,7 +298,7 @@ var StatsCommand = cli.Command{
 		req := &types.StatsRequest{
 			Id: context.Args().First(),
 		}
-		c := getClient()
+		c := getClient(context)
 		stream, err := c.GetStats(netcontext.Background(), req)
 		if err != nil {
 			fatal(err.Error(), 1)

ctr/events.go

@@ -14,7 +14,7 @@ var EventsCommand = cli.Command{
 	Name:  "events",
 	Usage: "receive events from the containerd daemon",
 	Action: func(context *cli.Context) {
-		c := getClient()
+		c := getClient(context)
 		events, err := c.Events(netcontext.Background(), &types.EventsRequest{})
 		if err != nil {
 			fatal(err.Error(), 1)

ctr/main.go

@@ -28,9 +28,9 @@ func main() {
 			Usage: "enable debug output in the logs",
 		},
 		cli.StringFlag{
-			Name:  "addr",
-			Value: "http://localhost:8888",
-			Usage: "address to the containerd api",
+			Name:  "address",
+			Value: "/run/containerd/containerd.sock",
+			Usage: "address of GRPC API",
 		},
 	}
 	app.Commands = []cli.Command{

hack/benchmark.go

@@ -5,6 +5,7 @@ package main
 
 import (
 	"flag"
+	"net"
 	"strconv"
 	"sync"
 	"time"
@@ -17,19 +18,26 @@ import (
 
 func init() {
 	flag.StringVar(&bundle, "bundle", "/containers/redis", "the bundle path")
+	flag.StringVar(&addr, "addr", "/run/containerd/containerd.sock", "address to the container d instance")
 	flag.IntVar(&count, "count", 1000, "number of containers to run")
 	flag.Parse()
 }
 
 var (
 	count        int
-	bundle string
+	bundle, addr string
 	group        = sync.WaitGroup{}
 	jobs         = make(chan string, 20)
 )
 
 func getClient() types.APIClient {
-	conn, err := grpc.Dial("localhost:8888", grpc.WithInsecure())
+	dialOpts := []grpc.DialOption{grpc.WithInsecure()}
+	dialOpts = append(dialOpts,
+		grpc.WithDialer(func(addr string, timeout time.Duration) (net.Conn, error) {
+			return net.DialTimeout("unix", addr, timeout)
+		},
+		))
+	conn, err := grpc.Dial(addr, dialOpts...)
 	if err != nil {
 		logrus.Fatal(err)
 	}